Question

On the application of a constant torque, a wheel is turned from rest through 400 radians in 10s. Find the angular acceleration.

(a) 6 rad/s^2

(b) 4 rad/s^2

(c) 2 rad/s^2

(d) 8 rad/s^2

Answer 1

Correct choice is (d) 8 rad/s^2

The best I can explain: θ=400rad

ω_0=0, t = 10s, α = ?

θ=ω0 t+1/2 αt^2

400 = 0+1/2 α10^2

α = 8 rad/s^2.